CN111822720A - Manufacturing method of blank for plastic working for manufacture of composite material, and blank manufactured by the aforementioned manufacturing method - Google Patents

Abstract

The present invention relates to a method for producing a billet for plastic working of composite materials, which is characterized by comprising: (A) producing composite powders by ball-milling two or more different types of material powders. A composite powder production step; and (B) a billet production step for producing a multi-layer billet containing the composite powder; wherein the multi-layer billet is composed of a core layer and two or more outer shell layers surrounding the core layer , the outer shell layers other than the above-mentioned core layer and the outermost outer shell layer are composed of the above-mentioned composite powder, the above-mentioned outermost outer shell layer is composed of pure metal or alloy, and the composition of the composite powder contained in the above-mentioned core layer and the outermost shell layer respectively is different from each other Similarly, the present invention can manufacture blanks for plastic processing that can overcome the limitation of the existing single-material blanks and realize the manufacture of customized composite materials according to the characteristics of different composite materials.

Description

Manufacturing method and utilization of blank for plastic working for manufacturing composite material The blank manufactured by the manufacturing method

technical field

The present invention relates to a method for producing a billet for plastic working, and a billet produced by the above-mentioned production method.

Background technique

Plastic working is a process that enables mass production of industrial materials without performing cutting operations such as machining. In particular, a shape close to the final product can be easily produced in a solid state without melting using a mold or frame having a desired shape.

However, currently, the material constituting the billet used in the plastic working process is limited to a single material, and it is therefore necessary to develop a billet manufacturing technique suitable for the manufacture of a composite material by plastic working.

[Prior Art Literature]

[Patent Literature]

(Patent Document 1) Korean Registered Patent No. 10-1590181 (Registration Date: 2016.01.25.)

(Patent Document 2) Korean Laid-Open Patent No. 10-2010-0066089 (Published Date: 2010.06.17.)

SUMMARY OF THE INVENTION

An object of the present invention is to provide a method for producing a billet for plastic working that can be used when a composite material is produced by a plastic working process such as extrusion, and a billet produced by the above-mentioned production method.

The present invention provides a method for producing a billet for plastic working of composite materials, which is characterized by comprising: (A) producing composite powders by ball milling two or more different types of material powders. A composite powder production step; and (B) a billet production step for producing a multi-layer billet containing the composite powder; wherein the multi-layer billet is composed of a core layer and two or more outer shell layers surrounding the core layer , the outer shell layers other than the above-mentioned core layer and the outermost outer shell layer are composed of the above-mentioned composite powder, the above-mentioned outermost outer shell layer is composed of pure metal or alloy, and the composition of the composite powder contained in the above-mentioned core layer and the outermost shell layer respectively is different from each other same.

In addition, there is provided a method for producing a blank for plastic working for producing a composite material, wherein the above-mentioned different kinds of materials are two kinds selected from the group consisting of metals, polymers, ceramics, and carbon-containing nanomaterials above.

In addition, there is provided a method for producing a billet for plastic working for producing a composite material, wherein the metal is made of Al, Cu, Ti, Mg, K, Ca, Sc, V, Cr, Mn, Fe , Co, Ni, Zn, Ga, Rb, Sr, Y, Zr, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb , W, Cd, Sn, Hf, Ir, Pt, and Pb. One metal or an alloy of two or more metals selected from the group.

In addition, there is provided a method for producing a blank for plastic working for producing a composite material, wherein the polymer is (i) selected from acrylic resin, olefin resin, vinyl resin, styrene resin, fluororesin and cellulose A thermoplastic resin selected from resins, or (ii) a thermosetting resin selected from phenolic resins, epoxy resins, and polyimide resins.

In addition, there is provided a method for producing a blank for plastic working for producing a composite material, wherein the ceramic is (i) an oxide ceramic, or (ii) a nitride, a carbide, a boride, and a silicide. Selected non-oxide ceramics.

In addition, there is provided a method for producing a blank for plastic working for producing a composite material, wherein the carbon nanomaterial is made of carbon nanotubes, carbon nanofibers, carbon nanoparticles, mesoporous carbon, carbon nanomaterials One or more selected from the group consisting of sheets, carbon nanorods, and carbon nanoribbons.

In addition, there is provided a method for producing a blank for plastic working of a composite material, wherein the multilayer blank comprises a core layer, a first shell layer surrounding the core layer, and a first shell layer surrounding the first shell layer. 2 outer shell layers.

In addition, there is provided a method of manufacturing a blank for plastic working for manufacturing a composite material, wherein the multilayer blank comprises: a first blank that constitutes the second outer shell layer and has a can-like shape; and a second blank, The said 1st shell layer is arrange|positioned inside the said 1st blank; and the 3rd blank, which comprises the said core layer, is arrange|positioned inside the said 2nd blank.

In addition, there is provided a method for producing a billet for plastic working of a composite material, characterized in that the billet manufacturing step of the above step (B) includes a process of extruding the composite powder at a high pressure of 10 MPa to 100 MPa.

In addition, there is provided a method for manufacturing a blank for plastic working of composite materials, characterized in that: the blank manufacturing step of the above step (B) comprises the step of heating the composite powder at 280°C to 600°C under a pressure of 30Mpa to 100Mpa. ℃ temperature for 1 second to 30 minutes spark plasma sintering (spark plasma sintering) engineering.

According to another aspect of the invention, the present invention provides a blank for plastic working for producing a composite material produced by the above-mentioned production method.

By applying the method for producing a billet for plastic working of the present invention, a billet for plastic working that can overcome the limitation of the existing single-material billet and realize the production of a customized composite material according to the characteristics of different composite materials can be produced.

Description of drawings

FIG. 1 is a process sequence diagram of a method for producing a billet for plastic working for producing a composite material to which the present invention is applied.

Figure 2 is a schematic diagram schematically illustrating the blank manufacturing process.

Figure 3 is an oblique view schematically illustrating an example of a multi-layer blank made in accordance with the present invention.

4 is a photograph [(a)] of a composite material produced by extruding an aluminum-containing billet in Example 4 and a photograph of a composite material produced by extruding an aluminum-containing billet in Comparative Example 2 [ (b)].

【Symbol Description】

10: Compound powder

11: 1st billet

12: Second billet

13: 3rd billet

20: Metal Cans

G: Director

C: cover

Detailed ways

During the description of the present invention, when it is determined that the specific description of related well-known functions or configurations may make the gist of the present invention unclear, the detailed description will be omitted.

Embodiments to which the concept of the present invention is applied are capable of various modifications and forms, and specific embodiments will be illustrated in the accompanying drawings and described in detail in this specification or application. However, this is not intended to limit the embodiment to which the concept of the present invention is applied to a specific disclosed form, but should be understood to include all changes, equivalents, and substitutes included in the idea and technical scope of the present invention.

The terms used in this specification are only used to describe a specific embodiment, and not to limit the present invention. Unless the context clearly indicates the contrary, a singular statement also includes a plural meaning. In this specification, terms such as "comprising" or "having" are only used to describe the existence of the described features, numbers, steps, actions, constituent elements, components or combinations thereof, and should not be understood as excluding one or more other Features, numbers, steps, actions, constituent elements, components, or combinations of the foregoing may exist or be added.

Next, the present invention will be described in detail.

FIG. 1 is a process sequence diagram of a method for producing a billet for plastic working for producing a composite material to which an embodiment of the present invention is applied.

Next, the manufacturing method of the above-mentioned blank for plastic working for manufacturing the composite material will be described with reference to the above-mentioned FIG. 1 .

Referring to the above-mentioned FIG. 1 , the above-mentioned manufacturing method of a blank for plastic working for manufacturing a composite material includes: step S10 , manufacturing a composite powder by ball milling two or more different types of material powders to produce a composite powder step; and, step S20, a billet manufacturing step of manufacturing a multi-layer billet containing the composite powder.

First, in step S10, a composite powder is produced by ball-milling two or more different kinds of material powders.

In this case, the above-mentioned two or more different kinds of materials can be selected from the group consisting of metals, polymers, ceramics, and carbon-containing nanomaterials.

The above metals can be selected from Al, Cu, Ti, Mg, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, Rb, Sr, Y, Zr, Mo, Ru, Rh, 1 metal selected from the group consisting of Pd, Ag, Cd, In, Sn, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb, W, Cd, Sn, Hf, Ir, Pt and Pb or an alloy of the above metals, but not limited to this.

In addition, the above-mentioned polymers can be made of (i) thermoplastic resins selected from acrylic resins, olefin resins, vinyl resins, styrene resins, fluorine resins, and cellulose resins, or (ii) selected from phenolic resins, epoxy resins, and polymer resins. The thermosetting resin selected from the imide resin is exemplified, but the type of polymer is not limited to the above-mentioned polymer.

The above-mentioned ceramics can be exemplified by (i) oxide ceramics, or (ii) non-oxide ceramics selected from nitrides, carbides, borides, and silicides, but are not limited thereto.

The carbon nanomaterial can be one or more selected from the group consisting of carbon nanotubes, carbon nanofibers, carbon nanoparticles, mesoporous carbon, carbon nanosheets, carbon nanorods and carbon nanoribbons, but is not limited to here.

In addition, as the above-mentioned two or more different types of material powders, recycled powders can be used.

As an example, the composite powder can be produced in this step by ball milling of aluminum or aluminum alloy powder and carbon nanotube (CNT).

The above-mentioned aluminum alloy powder can be any one selected from the group consisting of 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series and 8000 series.

By making the above-mentioned composite powder contain the above-mentioned carbon nanotubes, when a composite material is produced by plastic working such as extrusion, rolling, forging, etc. of a billet produced using the above-mentioned composite powder, since the corresponding composite material has high thermal conductivity, high Due to its strength and lightweight properties, it can be effectively used as a material for heat dissipation of various electronic components, lighting fixtures, and the like.

In addition, dispersion is difficult because of the large size difference between the micro-sized particles of the above-mentioned aluminum or aluminum alloys and the above-mentioned carbon nanotubes of micro-sized, and the above-mentioned carbon nanotubes may be affected by strong van der Waals forces. A dispersion inducer can be added in order to achieve uniform dispersion of the above-mentioned carbon nanotubes and the above-mentioned aluminum or aluminum alloy powders because aggregation tends to occur.

As the above-mentioned dispersion inducer, one selected from the group consisting of nano-SiC, nano-SiO ₂ , nano-Al ₂ O ₃ , nano-TiO ₂ , nano-Fe ₃ O ₄ , nano-MgO, nano-ZrO ₂ and mixtures thereof can be used. A nanometer-sized ceramic.

The above-mentioned nano-sized ceramics play the role of uniformly dispersing the above-mentioned carbon nanotubes among the above-mentioned aluminum or aluminum alloy particles, and especially the above-mentioned nano-SiC (nano Silicon carbide) has properties such as high tensile strength, sharpness, It has the advantages of stable electrical and thermal conductivity, high hardness, strong fire resistance, strong thermal shock resistance, high temperature properties and excellent chemical stability, so it is used as an abrasive and refractory material. In addition, the nano-SiC particles existing on the surface of the aluminum or aluminum alloy particles also play a role in suppressing the direct contact between the carbon nanotubes and the aluminum or aluminum alloy particles, thereby preventing the well-known carbon nanotubes and the aluminum. It has the effect of suppressing the formation of aluminum carbide caused by the defects formed by the reaction between aluminum alloys.

In addition, the above-mentioned composite powder can contain: 100 parts by volume of the above-mentioned aluminum or aluminum alloy powder; and 0.01 parts by volume to 10 parts by volume of the above-mentioned carbon nanotubes.

When the content of the carbon nanotubes relative to 100 parts by volume of the aluminum or aluminum alloy powder is less than 0.01 parts by volume, since the strength of the aluminum-containing composite material is similar to that of pure aluminum or aluminum alloy, it may not be able to sufficiently serve as a reinforcement. The effect of the material, on the contrary, when the content of the above-mentioned carbon nanotubes is more than 10 parts by volume, although the strength is increased compared with pure aluminum or aluminum alloy, it may lead to a decrease in elongation. In addition, when the content of the above-mentioned carbon nanotubes is excessively increased, difficulty in dispersion and degradation of mechanical and physical properties due to formation of defects may be caused.

In addition, when the above-mentioned composite powder further contains the above-mentioned dispersion inducer, the above-mentioned composite powder may further contain 0.1 to 10 parts by volume of the above-mentioned dispersion inducer with respect to 100 parts by volume of the above-mentioned aluminum powder.

When the content of the above-mentioned dispersion inducer relative to 100 parts by volume of the above-mentioned aluminum powder is less than 0.1 part by volume, it may cause a problem that the effect of dispersion induction is very small, and when it is more than 10 parts by volume, it may be caused by the aggregation of carbon nanotubes. Difficulties in dispersion and further lead to the formation of defects.

In addition, the above-mentioned ball milling can be specifically carried out at a low speed of 150 r/min to 300 r/min or a high speed of 300 r/min or more for 12 to 48 hours using a ball mill such as a horizontal type or planetary ball mill in an inert atmosphere such as nitrogen or argon. .

球以及直径

球1:1混合)100体积份至1500体积份之后进行。At this time, in the above-mentioned ball mill, stainless steel balls (with the diameter of

ball and diameter

1:1 mixing of balls) after 100 parts by volume to 1500 parts by volume.

In addition, in order to reduce the friction coefficient, one selected from the group consisting of heptane, hexane and ethanol can be used as an engineering control agent in a content of 10 to 50 parts by volume relative to 100 parts by volume of the composite powder. an organic solvent. The organic solvent is completely evaporated through the outer cover when the container is opened and the mixed powder is recovered after ball milling, so only the aluminum powder and the carbon nanotubes remain in the recovered mixed powder.

At this time, the above-mentioned nano-sized ceramics, that is, the dispersion inducer, will perform the same function as the above-mentioned nano-sized grinding balls by the rotational force generated in the above-mentioned ball milling process, and can separate the physically aggregated carbon nanotubes and pass through them. The above-mentioned carbon nanotubes are more uniformly dispersed on the surface of the above-mentioned aluminum particles by promoting the fluidity thereof.

Next, in step S20, a multilayer billet containing the composite powder obtained above is produced.

The above-mentioned multilayered blank produced in this step is characterized in that: it is composed of a core layer and two or more outer shell layers surrounding the above-mentioned core layer, and the outer shell layers other than the above-mentioned core layer and the outermost outer shell layer are composed of the above-mentioned composite powder. Composition, the outermost outer shell layer is composed of pure metal or alloy, and the composition of the composite powder contained in the core layer and the outer shell layer respectively (the types of different kinds of materials contained in the composite powder and/or the content of each different kind of material) different from each other.

Taking the case where the different kinds of materials contained in the above-mentioned composite powder are aluminum (or aluminum alloy) powder and carbon nanotube (CNT) as an example, the multi-layer billet produced in this step is characterized in that: a core layer and surrounding The core layer is composed of two or more shell layers, the shell layers other than the core layer and the outermost shell layer are composed of the composite powder, and the outermost shell layer is composed of (i) aluminum or aluminum alloy powder or (ii) In the composite powder structure described above, in the composite powders contained in the core layer and the outer shell layer, respectively, the volume fractions of carbon nanotubes with respect to the aluminum or aluminum alloy powder are different from each other.

The number of the outer shell layers included in the above-mentioned multilayer blank is not particularly limited, but it is preferable to constitute five or less layers in consideration of the economical efficiency and the like.

Figure 2 is a schematic diagram illustrating an example of a multi-layer blank manufacturing process as described above. Referring to FIG. 2 above, the blanks described above can be manufactured in the following manner. That is, in step S20-1, the above-mentioned composite powder 10 is charged into the metal can 20 through the guide G, and in step S20-4, the powder is prevented from flowing by sealing or pressing with the lid (C).

As the above-mentioned metal can 20, any metal having electrical conductivity and thermal conductivity can be used, and aluminum or aluminum alloy cans, copper cans, and magnesium cans can be preferably used. The above-mentioned metal can 20 can adopt a thickness of 0.5 mm to 150 mm on the assumption that the size of the blank is 6 inches, that is, different thickness ratios can be adopted according to the size of the blank.

FIG. 3 is an example of a multi-layer blank that can be produced in this step, which is a multi-layer blank including a core layer and two outer skin layers, that is, a core layer, a first outer skin layer surrounding the core layer, and a surrounding layer. A perspective view schematically illustrating a multilayer blank composed of a second outer shell layer of the first outer shell layer.

Referring to FIG. 3 , it is possible to first arrange a second blank 12 having a different composition from the first blank 11 as the first outer skin layer inside the first blank 11 having a hollow cylindrical shape as the second outer skin layer, and then Inside the second blank 12, a third blank 13 having a different composition from that of the second blank 12 as a core layer is arranged to produce a multilayer blank.

At this time, the first blank 11 has a cylindrical shape with a hollow inside, and may be a can shape with one side entrance closed, or a hollow cylindrical shape with both sides open. The first blank 11 It can be made of, for example, aluminum, copper, and magnesium. The said 1st blank 11 can be manufactured into the cylindrical shape with which the inside is hollow by melting the said metal base material, and inject|pouring into a die, or it can manufacture by machining.

The second ingot 12 can contain the composite powder produced as described above, and the second ingot 12 can be a bulk or a powder.

When the second blank 12 is a block, the second blank 12 can be specifically cylindrical, and the multilayer blank can be produced by arranging the cylindrical second blank 12 inside the first blank 11 . At this time, as a method of arranging the second ingot 12 inside the first ingot 11, the composite powder of the second ingot 12 can be melted and injected into a mold to produce a cylindrical shape, and then inserted into a cylindrical shape. It can be manufactured by entering the inside of the first blank 11 , or it can also be manufactured by directly inserting the composite powder into the inside of the first blank 11 .

The third blank 13 can be a metal bulk or powder.

Moreover, when the said 1st blank 12 or the said 3rd blank 13 etc. is a lump containing the said composite powder, the said composite powder can be manufactured into a lump shape by the system of high pressure extrusion or sintering.

At this time, the compositions of the composite powders contained in the second billet 12 and the third billet 13 are different from each other. Taking the case where the different types of materials contained in the composite powder are aluminum (or aluminum alloy) powder and carbon nanotube (CNT) as an example, the second billet 12 can contain the above-mentioned aluminum or aluminum alloy in 100 parts by volume. From 0.09 to 10 parts by volume of carbon nanotubes, the third blank 13 can contain more than 0 parts by volume and less than or equal to 0.08 parts by volume of the carbon nanotubes relative to 100 parts by volume of the aluminum or aluminum alloy powder.

Alternatively, the second ingot 12 may contain the composite powder, and the third ingot 13 may be made of the same material as the first ingot 11 made of aluminum, copper, magnesium, titanium, stainless steel, tungsten, cobalt, nickel, tin, and the aforementioned A certain metal block or metal powder selected from the group consisting of alloys.

The above-mentioned multilayer billet may include the second billet 120.01 to 10 vol% and the third billet 13 0.01 to 10 vol%, and the remaining volume of the first billet 11 with respect to the entire volume of the multilayer billet. .

In addition, because the above-mentioned multi-layer blank includes the above-mentioned second blank 12 or the above-mentioned third blank 13 containing the above-mentioned composite powder, before the above-mentioned sealing is performed, the above-mentioned multi-layer blank can further include: step S20-2, at 10MPa to 100MPa The high pressure for extrusion works.

By extruding the above-mentioned multilayered billet, the above-mentioned multilayered billet can then be subjected to plastic working such as extrusion using an extrusion die. When the extrusion condition of the above composite powder is less than 10MPa, it may cause pores in the manufactured plastic working composite material and may cause the flow of the above composite powder, and when it is greater than 100MPa, it may cause excessive pressure due to excessive pressure. It is so large that the above-mentioned second billet (meaning the billet after the second time) expands.

In addition, since the above-mentioned multilayer billet includes the above-mentioned second billet and/or the above-mentioned third billet containing the above-mentioned composite powder, in order to subsequently provide the above-mentioned multilayer billet to a plastic working process such as extrusion, the step of: S20-3, the process of sintering the above-mentioned multilayer blank.

In the above-mentioned sintering process, a sintering apparatus such as spark plasma sintering or hot forging and pressure sintering can be used, and any sintering apparatus that can achieve the same purpose can also be used. However, when precise sintering is required in a short period of time, spark plasma sintering is suitable. In this case, spark plasma sintering can be performed at a temperature of 280° C. to 600° C. under a pressure of 30 MPa to 100 Mpa for 1 second to 30 minutes.

Next, the present invention will be described in detail with reference to the embodiments.

Embodiments to which the present invention is applied can be modified in many different forms, and therefore, it should not be construed that the scope of this specification is limited by the embodiments described in detail in the following content. The embodiments in this specification are only for the purpose of more complete disclosure of this specification to those having general knowledge in the relevant industry.

[Examples and Comparative Examples: Multilayer Blanks Containing Aluminum and Carbon Nanotubes and Extruded Materials thereof]

<Example 1>

As carbon nanotubes, those with a purity of 99.5% and diameters and degrees of 10 nm or less and 30 μm or less (products of OCSiAl Co., Ltd., Luxembourg) were used, and as aluminum powders, those with an average particle size of 45 μm and a purity of 99.8% of products (Korea, MetalPlayer products).

In addition, a multi-layered billet was produced so that the cylindrical third billet was located in the center of the metal can serving as the first billet and the second billet (composite powder) was located between the first billet and the third billet.

The second ingot contains an aluminum-carbon nanotube (CNT) composite powder containing carbon nanotubes in a volume ratio of 0.1 to 100 of the aluminum powder, the first ingot is made of aluminum 6063, and the third ingot is made of aluminum Made of 3003 alloy.

球以及直径

球进行混合)至30体积％并添加庚烷50ml，然后利用水平型球磨机在250rpm条件下进行24小时的低速球磨处理。接下来，在打开上述容器并通过外罩使上述庚烷全部蒸发之后对铝-碳纳米管(CNT)复合粉末进行回收。Specifically, the above-mentioned second billet is produced by the method described below. In the stainless steel container, the ratio of 100 volume ratio of aluminum powder and 0.1 volume ratio of carbon nanotubes was added to the stainless steel container, and then stainless steel balls (for diameter) were added to the inside of the container.

ball and diameter

The balls were mixed) to 30% by volume, and 50 ml of heptane was added, followed by a low-speed ball milling process at 250 rpm for 24 hours using a horizontal ball mill. Next, the aluminum-carbon nanotube (CNT) composite powder was recovered after the container was opened and the heptane was completely evaporated through the outer cover.

After the aluminum-carbon nanotube (CNT) composite powder produced above was charged into a gap of 2.5 t between the first billet and the third billet, it was extruded with a pressure of 100 MPa to produce the multilayered blank.

<Example 2>

In the same manner as in Example 1 above, an aluminum-carbon nanotube (CNT) composite powder having a carbon nanotube content of 1 volume ratio was produced, and a multilayer billet was produced.

<Example 3>

According to the same method as the above-mentioned Example 1, an aluminum-carbon nanotube (CNT) composite powder having a carbon nanotube content of 3 volume ratio was produced, and a multilayer billet was produced.

<Example 4>

The multilayer billet produced in Example 1 was directly extruded using a direct extruder under the conditions of an extrusion ratio of 100, an extrusion speed of 5 mm/s, an extrusion pressure of 200 kg/cm ² and a billet temperature of 460°C. Extrusion, thereby producing an aluminum-containing composite (FIG. 4(a)).

<Example 5>

The multilayer billet produced in Example 2 was directly extruded using a direct extruder under the conditions of an extrusion ratio of 100, an extrusion speed of 5 mm/s, an extrusion pressure of 200 kg/cm ² and a billet temperature of 460°C. Extrusion, thereby producing an aluminum-containing composite (FIG. 4(a)).

<Example 6>

The multilayer billet produced in Example 2 was directly extruded using a direct extruder under the conditions of an extrusion ratio of 100, an extrusion speed of 5 mm/s, an extrusion pressure of 200 kg/cm ² and a billet temperature of 460°C. Extrusion, thereby producing an aluminum-containing composite (FIG. 4(a)).

<Comparative Example 1>

A solution obtained by mixing an aluminum-carbon nanotube (CNT) mixture and a dispersion inducer (a solvent and a natural rubber liquid at a ratio of 1:1), which were mixed at a ratio of 10% by weight of carbon nanotubes (CNT) and 80% by weight of aluminum powder ) 1:1 mixing and irradiating ultrasonic waves for 12 minutes to produce a dispersion mixture, and then heat-treating the dispersion mixture at 500°C for 1.5 hours using a tubular furnace in an inert environment to completely remove the dispersion inducer component to produce a Aluminum-carbon nanotube (CNT) mixture. A billet was produced by putting the aluminum-carbon nanotube (CNT) composite powder produced above into an aluminum can having a diameter of 12 mm and a thickness of 1.5 mm and sealing it.

<Comparative Example 2>

The billet produced in Comparative Example 1 was subjected to hot forging powder extrusion using a hot forging extruder (product of Shimadzu Corporation, Japan, model UH-500kN) at an extrusion temperature of 450° C. and an extrusion ratio of 20. , thereby fabricating an aluminum composite (Fig. 4(b)).

[Test example 1: Measurement of mechanical properties of aluminum-containing composite materials]

The tensile strength, elongation, and Vickers hardness of the aluminum-containing composite materials produced in the above Examples and Comparative Examples were measured, and the results are shown in Table 1 below.

The above-mentioned tensile strength and elongation were measured under the tensile test conditions with a tensile speed of 2 mm/s and the method in the tensile test piece Ks standard No. 4, and the above-mentioned Vickers hardness was measured under the conditions of 300 g, 15 seconds, and method was determined.

<Table 1>

1) Al6063: Aluminum 6063

2) Al3003: Aluminum 3003

Referring to the above Table 1, it can be known that because the aluminum-containing composite materials produced in the above-mentioned Examples 4 to 6 use the materials of strong material (Al6063) and soft material (Al3003), it is different from the aluminum-containing composite materials. Compared with extrusion, it has both strength and flexibility.

In addition, it was found that although the Vickers hardness of the aluminum-containing composite material produced in the above-mentioned Comparative Example 2 was high, the elongation was very low.

[Test Example 2: Measurement of Corrosion Resistance of Aluminum-Containing Composite Materials]

The corrosion resistance properties of the aluminum-containing composite materials produced in the above Examples and Comparative Examples were measured, and the results are shown in Table 2 below.

The above characteristics were measured by the seawater spray test method using a sample of size 10*10 and thickness of 2mm in accordance with the copper salt accelerated acetate spray test (CASS) standard.

<Table 2>

1) Al6063: Aluminum 6063

2) Al3003: Aluminum 3003

Referring to the above Table 2, it can be seen that because the aluminum-containing composite material produced in the above Example 5 uses a material with a strong material (Al6063) and a material with excellent corrosion resistance (Al3003), even if a small amount of carbon nanometers is added In the case of the tube (CNT), the corrosion resistance is greatly improved compared to the case of extruding the aluminum-containing composite material. In addition, it can be seen that although the aluminum-containing composite material produced in the above-mentioned Comparative Example 2 exhibits a higher value than the pure alloy, it is lower than that of the aluminum-containing composite material produced in the above-mentioned Example 5.

[Test Example 3: Measurement of Thermal Conductivity of Aluminum-Containing Composite Materials]

The density (density), heat capacity (heat capacity), thermal diffusivity (diffusivity), and thermal conductivity (thermal conductivity) of the aluminum-containing composite materials produced in the above examples and comparative examples were measured, and the results are shown in the following table 3 shown.

The above-mentioned density was measured using Archimedes' principle in accordance with ISO standards for the above-mentioned aluminum-containing composite material. The above-mentioned heat capacity and thermal diffusivity were measured using a laser flash method on a sample with a size of 10*10 and a thickness of 2mm. , the above thermal conductivity is calculated by the product of the measured density * heat capacity * thermal diffusivity.

<Table 3>

1) Al6063: Aluminum 6063

2) Al1005: Aluminum 1005

3) SWCNTs: single-walled carbon nanotubes

Referring to the above Table 3, it can be seen that because the aluminum-containing composite material produced in the above Example 6 uses a strong material (Al6063) and a soft and excellent thermal conductivity pure Al series (Al1005) material, so even in the With the addition of a small amount of carbon nanotubes (CNTs), the thermal conductivity was greatly improved compared to the extrusion of aluminum-containing composites.

In addition, it can be seen that although the aluminum-containing composite material produced in the above-mentioned Comparative Example 2 exhibits a higher value than that of the pure alloy, it is lower than that of the aluminum-containing composite material produced in the above-mentioned Example 6.

The preferred embodiment applicable to the present invention has been described in detail in the above content, but the above embodiment is only introduced as a specific example of the present invention, and the present invention is not limited thereby. Various modifications and improvements made to the basic concept of the present invention defined in the claims should also fall within the scope of the claims of the present invention.

Claims (11)

1. A method for manufacturing a plastic working billet for manufacturing a composite material, comprising:

(A) a composite powder production step of producing a composite powder by ball milling (ballmill) 2 or more different kinds of material powders;

and (B) a billet manufacturing step of manufacturing a multilayer billet (billet) containing the composite powder;

wherein, the above-mentioned multi-layer blank,

comprises a core layer and more than 2 outer shell layers surrounding the core layer,

the outer shell layers other than the core layer and the outermost outer shell layer are composed of the composite powder, the outermost outer shell layer is composed of a pure metal or an alloy,

the compositions of the composite powders respectively contained in the core layer and the shell layer are different from each other.

2. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 1, wherein:

the different kinds of materials are 2 or more selected from the group consisting of metals, polymers, ceramics, and carbon-containing nanomaterials.

3. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 2, wherein:

the metal is 1 metal or an alloy of 2 or more metals selected from the group consisting of Al, Cu, Ti, Mg, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, Rb, Sr, Y, Zr, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb, W, Cd, Sn, Hf, Ir, Pt and Pb.

4. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 2, wherein:

the polymer is (i) a thermoplastic resin selected from acrylic resins, olefin resins, vinyl resins, styrene resins, fluororesins, and cellulose resins, or (ii) a thermosetting resin selected from phenolic resins, epoxy resins, and polyimide resins.

5. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 2, wherein:

the ceramic is (i) an oxide ceramic or (ii) a non-oxide ceramic selected from the group consisting of nitrides, carbides, borides, and silicides.

6. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 2, wherein:

the carbon nanomaterial is at least 1 selected from the group consisting of carbon nanotubes, carbon nanofibers, carbon nanoparticles, mesoporous carbon, carbon nanosheets, carbon nanorods, and carbon nanobelts.

7. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 1, wherein:

the above-mentioned multi-layer blank is,

the composite material is composed of a core layer, a 1 st outer shell layer surrounding the core layer and a 2 nd outer shell layer surrounding the 1 st outer shell layer.

8. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 7, wherein:

the multilayer blank described above comprises:

a 1 st blank constituting the 2 nd outer shell layer and having a can-like shape;

a 2 nd blank constituting the 1 st outer shell layer and disposed inside the 1 st blank; and the number of the first and second groups,

and a 3 rd billet constituting the core layer and disposed inside the 2 nd billet.

9. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 1, wherein:

the billet manufacturing step in the step (B) includes a step of pressing the composite powder at a high pressure of 10MPa to 100 MPa.

10. The method of manufacturing a plastic working billet for manufacturing a composite material according to claim 1, wherein:

the blank manufacturing step of the step (B) includes a step of performing spark plasma sintering (spark plasma sintering) of the composite powder at a pressure of 30Mpa to 100Mpa and a temperature of 280 ℃ to 600 ℃ for 1 second to 30 minutes.

11. A plastic working billet for use in the production of a composite material, characterized in that:

the method according to claim 1.

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